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  1. Prepare
  2. Java
  3. Data Structures
  4. Java Arraylist
  5. Discussions

Java Arraylist

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826 Discussions

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  • gurvinder9824
     + 0 comments
        Scanner scan = new Scanner(System.in);
    int n = scan.nextInt();

    ArrayList<String> arrayList = new ArrayList<>();
    while(n>0) {

        int a=scan.nextInt();
        if(a > 0) {
            arrayList.add(scan.nextLine());
        } else {
            arrayList.add("");
        }

        n--;
    }                

    int q = scan.nextInt();

    while(q>0){

        int x = scan.nextInt();
        int y = scan.nextInt();

        try{
            String str = arrayList.get(x-1);

            if(!str.isEmpty()) {
                String[] strArr = str.trim().split(" ");
                System.out.println(strArr[y-1]);
            } else {
                System.out.println("ERROR!");    
            }
        } catch(IndexOutOfBoundsException e) {
            System.out.println("ERROR!");
        }

        q--;
    }


}

    }

  • mufaddal_maimoon
     + 0 comments

    Scanner sc = new Scanner(System.in); int n = sc.nextInt();

        List<List<Integer>> lines = new ArrayList<>();

    for(int i = 0; i<n; i++)
    {
        int d = sc.nextInt();
        List<Integer> line = new ArrayList<>();

        for(int j=0; j<d; j++)
        {
            line.add(sc.nextInt());
        }
        lines.add(line);
    }

    int q = sc.nextInt();

    for(int i=0; i<q;i++)
    {
        int x = sc.nextInt();
        int y = sc.nextInt();

        try 
        {
            System.out.println(lines.get(x-1).get(y-1));
        }
        catch (IndexOutOfBoundsException e) 
        {
            System.out.println("ERROR!");
        }
     }

}

  • sumit_next21
     + 0 comments
    Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        scan.nextLine();
        int ar[][] = new int[n][];
        for(int i=0;i<n;i++){
            String s[] = scan.nextLine().split(" ");
            ar[i] = new int[s.length]; 
            for(int j=0;j<ar[i].length;j++){
                ar[i][j] = Integer.valueOf(s[j]);
            }
            // System.out.println(Arrays.toString(ar[i]));
        }
        int qSize = scan.nextInt();
        // System.out.println("Q "+qSize);
        for(int i=0;i<qSize;i++){
            int x= scan.nextInt();
            int y =scan.nextInt();
            try{
                System.out.println(ar[x-1][y]);
            }catch(Exception e){
                System.out.println("ERROR!");
            }
        }
        scan.close();

  • suryasivakumar15
     + 0 comments
            ArrayList <ArrayList> matrix = new ArrayList<>();
        Scanner s = new Scanner(System.in);
        
        int lineCount = s.nextInt();
        //System.out.println("LineCount= " + lineCount);
        
        s.nextLine();
        
        for(int i=0; i<lineCount; i++){
            ArrayList tmpAL = new ArrayList<>();
            String[] stmp = s.nextLine().trim().split(" ");
            
            for(int j=0; j<stmp.length; j++){
               tmpAL.add(stmp[j]);
               //System.out.println("stmp " + stmp[j]);
            }
            
            matrix.add(tmpAL);
        }
        
        int queryCount = s.nextInt();
        //System.out.println("QC: " + queryCount);
        
        for(int i=0; i<queryCount; i++){
            int x = s.nextInt();
            int y = s.nextInt();
          
            //System.out.println(matrix.get(x-1).get(y));
            
            try{
                System.out.println(matrix.get(x-1).get(y));
            } catch(Exception ex){
                System.out.println("ERROR!");
            }
        }
        
        s.close();
    }

  • dhdhdcbsndnvcb
     + 0 comments
    class Solution {
    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        int length = scn.nextInt();
        ArrayList<Integer>[] lista = new ArrayList[length + 1];
        int a = 1;
        while (a <= length) {
            lista[a] = new ArrayList<>();
            lista[a].add(scn.nextInt()) ;
            for (int j = 1; j < lista[a].get(0) + 1 ; ++j) {
                lista[a].add(scn.nextInt());
            }
            ++a;
        }
        int queries = scn.nextInt();
        while (queries > 0) {
            int x = scn.nextInt();
            int z = scn.nextInt();
            if (z <= lista[x].get(0)) {
                System.out.println(lista[x].get(z));
            } else if (z > lista[x].get(0) || lista[x] == null){
                 System.out.println("ERROR!");
            }
            --queries;
        }
    }
}